The battle should stop when one side hasn't any stacks left and not when the strength meter has become completely red or blue.
In a battle situation, the last stack was reduced to 0 units, but wasn't eliminated because the arrow hadn't reached the top/bottom part of the strength meter.
In a battle situation, the last stack was reduced to 0 units, but wasn't eliminated because the arrow hadn't reached the top/bottom part of the strength meter.
